Most everyone can agree that the 83rd Annual Academy Awards ended on a high note when Staten Island's PS 22 choir took the stage to perform "Somewhere Over the Rainbow." Now, they're back on the Oscar stage and getting a special surprise from one of today's biggest pop stars—Katy Perry! Along with the children from the PS 22 choir, Katy sings her hit song "Firework." 

Watch the special performance!

"I really believe that everyone has a spark, and that's why I wrote this song. You start with a spark, and then it's up to you to make it into a beautiful, glorious firework," Katy says.


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